Mary and her brother were cooking dinner for their parents.
1. Negative sentence:
1. Negative sentence:
2. General question:
2. General question:
3. Special question to the words Mary and her brother,
4. Special question to the word dinner.

1.Negative sentence: Mary and her brother were not cooking dinner for their parents.

2. General question: Were Mary and her brother cooking dinner for their parents?

3. Special question to the words Mary and her brother: what were Mary and her brother doing?

4. Special question to word dinner: Were the dinner cooking for their parents?